Ignition-valve.



JIITED STATES ,PATENT FFIQE,

EDMUND SCHROEDTER, OF BROOKLYN, NEW YORK. 'i

IGNITION-VALVE.

Application filed September 19, 1918.

of heat from the exhaust gases suilicient to provide for ignition of the fresh charges in the combustion chamber.

A special object of the invention has beenV to secure suilicient heating of the ignition tube to insure proper ignition of the charge at all times, and especially at the lower engine speeds, when the heat to be derived from the exhaust gases is lesser than at the higher engine speeds.

This latter object I have accomplished in part by locating a portion of the ignition tube transversely of the path of the exhaust gases so as to be entirely surrounded and fully heated thereby.

Other features of the invention will appear as the speciiication proceeds.

In the accompanying drawing, I have illustrated the invention embodied in one of its practical forms, but as this disclosure is principally for illustrative purposes, it will be understood that various changes and modifications may be made without departure Jfrom the true spirit and scope of the invention.

In said drawing:

Figure l is a cross sectional view of an engine cylinder having an exhaust valve constructed in accordance with and embodying features of this invention.

Fig. 2 is a plan view of said valve.

Fig. 3 is a cross sectional view of the same taken substantiallv on the plane of line 3-3 of Fig. l.

Referring to the drawing now in detail, 5 designates an engine cylinder having a piston 6 working therein, the combustion chamber of said cylinder being designated 7, and the exhaust port or passage being designated 8.

Specification of Letters Patent. Pai-,guted Dec. l()j 1918.

Serial No. 253,376.

The valve shown is oi the puppet type embodying` a head 9 and a stem 10, said valve fitting a cooperating conical valve seat 11. v

The ignition tube consists in the present disclosure oi an annular section or ring 12 oi' tubing having a plurality ci branches 13 opening up through the top of the valve, In the case illustrated, there are .three such branches providing openings from the tube up through the valve at three Adifferent points. These branches or outlets are preferably distributed at equal distances apart so as to firmly lsupport the lateral portion of the tube.

The tube, including the outlet or tiring portions 13- and the laterally extending heating portion 12 may be made in one piece, but .at the present time I find it easiest to make the lateral heating portion 12 as a complete ring and to join the branches 13 thereto as by means of the T-shaped couplings 14 which may be stamped to shape from sheet metal and then welded or otherwise secured in position aboutv the ring and the end portions of the tube sections 13.

The ignition` tube is made of a material which will withstand the intense heat to which -it is subjected.y lAt vthe present time I find pure nickel tubing the material best suited to this purpose.

The operation it is believed will be readily understood from the foregoing, it being apparent that as the exhaust valve opens t e hot exhaust gases escaping past the conical valve seat and the adjoining conical faces of the valve will converge upon the lateral or heating portion of the hot tube which is disposed directly across and transversely ot such iow. This brings the tube to a high degree of heat, and entirely surrounded as it is by the exhaust gases thel tube is kept hot enough Jfor ignition purposes even when the engine is running slowly. As the tube has a plurality of rino' outlets, the charge will be ignited from a pliirality of points and hence very rapid iame propagation is secured. Also, if one of the firing tubes should for any reason fail to ignite the charge, ignition is still insured by the presence of the other tube elements. The tube is ordinarily maintained so hot as to prevent carbonization, but if there is any tendency to carbonize, this is ordinarily overcome by the sweeping action of the gases through the tube, it being `low, as in the case illustrated, Where there would not be room for a long dependent tube. In the illustration I have shown how this forni of ignition tube may be employed even in constructions Where the valve stem guide comes up very close to the bottom of the valve head. In such illustration the guide, which is designated 15, coines up nearly to the bottom of the valve and the ring portion of the hot tube practically surrounds this guide, that is When the valve is seated.

I claini:

l. In a gas engine valve, a valve head and an igniter tube supported beneath said valve head and Opening up through the top of the valve head at a plurality of points.

2. In a gas engine valve, a valve head, an igniter tube supported beneath the valve head, and a plurality of branches from said tube extending` up through the top of the valve head.

3. A gas engine valve comprising a valve stein and a head supported thereby, a ring disposed about the valve stein beneath the head, and a plurality of branches extending from said ring up through the top of the valve head.

4. A gas engine valve comprising a valve stem and a head Carried thereby, an igniter tubev in the forni of a ring encircling the valve stein beneath the head and connected at a plurality of points With the valve head by tubular branches open to the top of the valve head.

5. A gas engine valve comprising a valve stein and a head carried thereby, tubular ignition elements connected with the valve head and open to the upper side thereof, and a tubular portion beneath the valve head connecting the tubular elements aforesaid.

6. A. gas engine valve comprising a' valve stern and a head carried thereby, and an igniter tube secured to thel valve head having its interior open to the top of the valve and having a dependent portion extending substantially laterally beneath the valve head and thereby positioned substantially transversely of the flow of gas past the valve.

7. In combination, an exhaust valve and a cooperating conical valve seat arranged to direct the exhaust gases on convergent lines, and an igniter tube carried by said valve and having a substantially laterally extending heating` portion disposed substantially transversely of said convergent flow of exhaust gases. i

8. In a gas engine, an exhaust valve and a' cooperating conical valve seat engaged thereby, and an igniter tube Carried by said valve and having an annular heating portion disposed in the direct path of the exhaust gases traversing the conical valve seat.

9. A gas engine exhaust valve comprising a valve stein, a head carried thereby and an igniter consisting of a tubular ring substantially surrounding the stern beneath the head and having it-s interior open to the top of the valve.

EDMUND SCHROEDTER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

